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Graphics Interchange Format  |  1997-01-13  |  96KB  |  781x555  |  4-bit (16 colors)

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OCR: Untrusted Firewall Trusted Network Host Network Type 1: Dual-homed gateway (application-level) Untrusted Screening Firewall Trusted Network Router Host Network Type 2: Screened host gateway (packet-level) Untrusted Network Screening Router Firewall Host Supplementary Host Screening Trusted Router Network Type 3: Screened subnet gateway (packet-level) Figure 2 - Three ways to protect

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